This commit reverts part of the changes done in the following commit:
- ff50963c7f -
"axi_ad9361- altera/xilinx reconcile- may be broken- do not use"
The above mentioned commit introduced latency variations on the Rx path
at different sample rates, or within the same sample rate after sample
rate changes. The variation is caused by multiple positions of the frame
detection combined with a free running toggle (rx_valid) that is not synchronized
with the actual samples.
Having a single frame detection position eliminates the latency
variation.